Well, it seems like there’s some kind of force that has arrived in New York City and I imagine you guys are there to put a stop to whatever that is.

RENNER: We’re avenging something.

JOHANSSON: We’re avenging something.

RENNER: (laughs) We’re fighting, I can tell you that, so it’s hot and sweaty.

Each other?

JOHANSSON: Perhaps. We’re fighting together, I think, and we’re having a good time. It’s good fun, a lot of work.

.....RENNER: (laughs) Aren’t you going off to do Iron Man 3?

JOHANSSON: Yeah, we’re on the same flight. I think the whole idea is that you want the audience to be as enthusiastic as you are about the characters and in that, you hope that you’ll be able to take the character farther. It’s certainly a process to zip up the suit every time and it gets harder with each passing year, but I mean, if it was badass and it incorporated the darker side of the character and got down to the nitty-gritty of who she is, I would like to see that movie.

Scarlett Johansson Iron Man 2

Scarlett Johansson signed for NINE films

Brief story at fandango about the future for the Black Widow / Natasha Romanoff character in the Marvel movieland:

"...it is an indication of where Marvel plans to go once they're done with their current crop of superhero cross-promotion. While speaking at a press conference for the new Iron Man 2 DVD, Marvel chief Kevin Feige admitted that they're currently working on a spin-off film for Scarlett Johansson's Black Widow character. He noted, "We've already started discussions with Scarlett about the idea, but The Avengers comes first." Feige later added that they haven't done much else except begin to put concepts together."

Hopefully Johansson will fair better than Halle Berry did with the Batman-spinoff "Catwoman" movie from 2004, which seemed to demonstrate Warners/DC Comics have a difficulty putting together a standalone character film for superhero characters (unless it is directed by Chris Nolan). Marvel Studios seems to have a better sense of what to do.